Upgrade bazlets to latest master to build with 2.16-rc3 API

Change-Id: I7194e7a5ab90a601ddbba45e2373d6821e378b54
diff --git a/WORKSPACE b/WORKSPACE
index 43094cb..9c23406 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "b54eaed487d37188120da6933b97c571519954ca",
+    commit = "d044cd60d37e302d9ac324f7a2c4e48b4011d4e6",
     #local_path = "/home/<user>/projects/bazlets",
 )